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INTEGRITY CONSTRAINTS
PRNSENTED BY
S.BALAMURUGAN
ASSISTANT PROFESSOR
DEPT OF COMPUTER SCIENCE
SBK COLLEGE ,ARUPPUKOTTAI
INTEGRITY CONSTRAINTS
Integrity Constraints (IC) is a condition specified by a database scheme
And restrict data that can be stored in an instance of the database.
Five types of integrity constraints :
1.Primary key
2.Foreign key
3.Unique
4.Not null
5.Check
1.Primary key
 It is not allowed null values
 It is not allowed duplicate values.
 Uniquely identified each row of the table.
2.Foreign key
The information stored in a relation is linked to the
Information stored in another relation.
3. Unique
 uniquely identified each row of the table.
 It is allowed null values.
4.Not null
It is not allowed null values.
Specifying primary key constraints
CREATE TABLE students (sid number(10),
name varchar(20),
login varchar(10),
age number(3),
gpa real(2,2),
CONSTRAINT stunent_key PRIMARY KEY(sid));
Specifying UNIQUE constraints
CREATE TABLE students (sid number(10),
name varchar(20),
login varchar(10),
age number(3),
gpa real(2,2),
UNIQUE(NAME,AGE);
Specifying FORIEGN key constraints
CREATE TABLE ENROLLED (studid number(10),
cid varchar(20),
grade varchar(5);
FOREIGN KEY(studid) REFERENCES student (sid));
Specifying NOT NULL and CHECK constraints
CREATE TABLE students (sid number(10),
name varchar(20),
login varchar(10) NOT NULL,
age number(3),
gpa real(2,2),
CHECK age 17 between 21);
(
 Enrolled relation student
relation
cid Grade Studid
cs101 A 53831
ee102 B 53832
ec103 C 53834
it104 A 53835
ca105 C 53836
ta106 B 53837
sid name login Age gpa
53831 Bala bala@cs 21 7.5
53832 Arun arun@ec 22 7.4
53834 Cyril Cyril@it 21 6.8
53836 Baskar baskar@ca 22 6.3
53837 Vijay vijay@ta 21 8.7
53839 ajith Ajit @cs 22 6.4
Enrolled relation student relation
THANK U

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Integrity constraints

  • 1. INTEGRITY CONSTRAINTS PRNSENTED BY S.BALAMURUGAN ASSISTANT PROFESSOR DEPT OF COMPUTER SCIENCE SBK COLLEGE ,ARUPPUKOTTAI
  • 2. INTEGRITY CONSTRAINTS Integrity Constraints (IC) is a condition specified by a database scheme And restrict data that can be stored in an instance of the database. Five types of integrity constraints : 1.Primary key 2.Foreign key 3.Unique 4.Not null 5.Check
  • 3. 1.Primary key  It is not allowed null values  It is not allowed duplicate values.  Uniquely identified each row of the table. 2.Foreign key The information stored in a relation is linked to the Information stored in another relation. 3. Unique  uniquely identified each row of the table.  It is allowed null values. 4.Not null It is not allowed null values.
  • 4. Specifying primary key constraints CREATE TABLE students (sid number(10), name varchar(20), login varchar(10), age number(3), gpa real(2,2), CONSTRAINT stunent_key PRIMARY KEY(sid)); Specifying UNIQUE constraints CREATE TABLE students (sid number(10), name varchar(20), login varchar(10), age number(3), gpa real(2,2), UNIQUE(NAME,AGE);
  • 5. Specifying FORIEGN key constraints CREATE TABLE ENROLLED (studid number(10), cid varchar(20), grade varchar(5); FOREIGN KEY(studid) REFERENCES student (sid)); Specifying NOT NULL and CHECK constraints CREATE TABLE students (sid number(10), name varchar(20), login varchar(10) NOT NULL, age number(3), gpa real(2,2), CHECK age 17 between 21); (
  • 6.  Enrolled relation student relation cid Grade Studid cs101 A 53831 ee102 B 53832 ec103 C 53834 it104 A 53835 ca105 C 53836 ta106 B 53837 sid name login Age gpa 53831 Bala bala@cs 21 7.5 53832 Arun arun@ec 22 7.4 53834 Cyril Cyril@it 21 6.8 53836 Baskar baskar@ca 22 6.3 53837 Vijay vijay@ta 21 8.7 53839 ajith Ajit @cs 22 6.4 Enrolled relation student relation